. >>> and some new developments in the decades-old search for teamsters' boss jimmy hoffa. police in detroit have received a new trip that hoffa is buried under the driveway you see there. they're now taking soil samples. thousands of tips have come in since hoffa vnished back in 1975. >>> finally, the prime minister of great britain, perhaps a little embarrassed this morning. he was on david letterman last night. got a pop quiz on british history. he did rather well. but he missed two. he knew which year the magna carta was signed. hear, hear. but he didn't know what magna carta meant. it means great charter. he also couldn't name the composer of "rule britannia." that composer is? thomas arnes. see i -- it's fine. >> you just knew that. it was just in your head. >> i didn't. i'm going to guess there aren't a ton of brits that know it, either. on par, he can be excused. he did rather well. >> a pop quiz. that's tough. >> those are the only two he missed. >> little high-risk for a british prime minister on "letterman." josh, thanks. >>> the race for the white house. "your v